Unplanned Outage: Widespread Microsoft 365 Outages
Last Updated:
2026-01-23 07:46:35
Event:
2026-01-22 15:32:00
Status:
Closed
Brief Description:
The vendor reports the issue that resulted in degraded Microsoft 365 services was resolved around midnight. Delayed email messages began flowing again early this morning and other Microsoft 365 services have returned to a healthy state.
User Impact:
delayed messages should appear today
Workaround:
There is no workaround for this issue
Current Status:
returned to service
Services Affected:
Email and Calendar
Subsites Affected:
Email for Faculty and Staff
Full Description:
RESOLVED: The vendor reports the issue that resulted in degraded Microsoft 365 services was resolved around midnight. Delayed email messages began flowing again early this morning and other Microsoft 365 services have returned to a healthy state.
Prior updates:
7:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their 6:40pm ET update, the vendor says the problem still persists. Their next update is expected around 11:20pm ET. CIT will continue monitoring their progress.
5:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their recent update, the vendor says the problem still persists. CIT will continue monitoring their progress.
Widespread Microsoft 365 Outages - previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue.
Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery.
Prior updates:
7:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their 6:40pm ET update, the vendor says the problem still persists. Their next update is expected around 11:20pm ET. CIT will continue monitoring their progress.
5:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their recent update, the vendor says the problem still persists. CIT will continue monitoring their progress.
Widespread Microsoft 365 Outages - previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue.
Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery.
CIT TDX ID:
2110372
Timeline of Changes
| Description | Current Status | Date | Time |
|---|---|---|---|
RESOLVED: The vendor reports the issue that resulted in degraded Microsoft 365 services was resolved around midnight. Delayed email messages began flowing again early this morning and other Microsoft 365 services have returned to a healthy state. Prior updates: 7:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their 6:40pm ET update, the vendor says the problem still persists. Their next update is expected around 11:20pm ET. CIT will continue monitoring their progress. 5:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their recent update, the vendor says the problem still persists. CIT will continue monitoring their progress. Widespread Microsoft 365 Outages - previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue. Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery. |
returned to service |
2026-01-23 | 07:46:35 |
7:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their 6:40pm ET update, the vendor says the problem still persists. Their next update is expected around 11:20pm ET. CIT will continue monitoring their progress. 5:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their recent update, the vendor says the problem still persists. CIT will continue monitoring their progress. Widespread Microsoft 365 Outages - previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue. Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery. |
Outlook email delivery is delayed |
2026-01-22 | 19:02:28 |
5:00pm ET Vendor update: Microsoft 365 customers may see degraded service functionality or be unable to access multiple Microsoft 365 services. In their recent update, the vendor says the problem still persists. CIT will continue monitoring their progress. Widespread Microsoft 356 Outages - previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue. Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery. |
Outlook email delivery is delayed |
2026-01-22 | 17:14:33 |
Widespread Microsoft 356 Outages Previous reports of delayed Outlook email messages are linked to a broader issue of widespread Microsoft 365 outages. Teams channels may also be experiencing performance issues due to those outages. The vendor expects to make their next update at 5pm ET. CIT continues monitoring the issue. Previously, CIT was investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We saw delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery. |
Outlook email delivery is delayed |
2026-01-22 | 16:00:35 |
CIT is investigating delayed Outlook messages, possibly linked reports of widespread Microsoft 365 outages. We see delays and queued or undelivered email for messages sent via e-lists and appsmtp since about 2pm ET. This incident appears to be impacting all Outlook emails services, both desktop clients and on the web. CIT will continue working to identify the issue and resolve the delayed delivery. |
Outlook email delivery is delayed |
2026-01-22 | 15:38:12 |